Interfaces - HBM PW20i Kurzanleitung

14
5

Interfaces

The PW20i-load cells are delivered as required either with an RS-232- or
RS-485-interface. Baud rates of 1200...115200 Baud can be set for both
interfaces. The ground reference for all interface signals is based on the
power supply ground of the PW20i load cell. The RS-232-interface is suitable
for a point to point connection (one PW20i-load cell to one interface). Only the
signals RxD ( Receive Data ), TxD ( Transmit Data ) and GND are required.
Supply voltage and interface, PW20i RS-232-version
Pin assignment
for PC (RS–232):
Dev. socket 25 pin Dev. socket 9 pin
(solder side) (solder side)
1
14
2 TxD
6
RxD
3
9
GND
7
Ground /
enclosure
25
13
Connection of several load cells to a computer via an RS-485-bus
TA (TX–)
TB (TX+)
RA (RX–)
RB (RX+)
UB
GND
PC
HBM
Ground DC supply
/ Housing
–
RxD
1
2
TxD
3
GND
5
Shielding
PW20i
+
red
blue
gray
white
RS-485 / 4-wire BUS
PW20i
PW20i
RS -232
+12 ... 30 V
TxD
RxD
GND
PW20i
A1243-1.0 de/en/fr/es